A specific student expelled all of the ghosts in a haunted schoolhouse years ago. They've returned—and they're out for vengeance... Satsuki and Keiichirou Miyanoshita are two siblings who have recently lost their mother. After relocating to their mother's hometown, they discover that the local school to which they have moved is an ancient structure that is rumored to be haunted. Despite dismissing it at first as a ridiculous tale, the two quickly realize that ghosts are real and that they are following them! Gakkou no Kaidan is the spooky story of these brothers and their newfound pals as they attempt to survive the school's ghosts—with a little help from their beloved cat along the way.